Integrated personal digital assistant device

ABSTRACT

A mobile computing device is disclosed. In some aspects, the mobile computing device may execute a first application using one or more processors, and may receive, during execution of the first application, a user selection of a shift key. The mobile computing device may transition a state of the shift key from an unlocked non-shift state to a shift state based on the user selection. The mobile computing device may change the execution of the first application to an execution of a second application, and clear the state of the shift key in response to changing the execution from the first application to the second application.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. patent application Ser. No.14/947,513, filed on Nov. 20, 2015, which is a Continuation of U.S.patent application Ser. No. 13/117,729, filed on May 27, 2011, now U.S.Pat. No. 9,203,940, which is a Continuation of U.S. patent applicationSer. No. 12/163,948, filed Jun. 27, 2008, now U.S. Pat. No. 8,224,379,which is a Continuation of U.S. patent application Ser. No. 09/976,475,filed on Oct. 12, 2001, now U.S. Pa. No. 7,395,089, which claimspriority and benefit under 35 USC §119(e) to U.S. Provisional PatentApplication No. 60/297,817, filed on Jun. 11, 2001, each of which isincorporated herein by reference in its entirety.

FIELD OF INVENTION

The present invention is related generally to a user interface for apersonal digital assistant device.

DESCRIPTION OF RELATED ART

Carrying a personal digital assistant (PDA) around is very convenientfor tasks such as taking notes at a meeting or lecture, schedulingappointments, looking up addresses, and for performing a whole host ofother functions. However, one function not easily performed with a PDAis that of telecommunications. A typical cellular telephone, meanwhile,offers a range of features, from speed dial to speakerphone tocaller-ID, phonebook, etc. In order to have the functionality of acellular telephone and the functionality of a PDA, consumers havegenerally had to choose from a selection of largely unsatisfactoryoptions. The most common option is to carry both a PDA and cell phone.This is undesirable, however, because of the obvious impractical aspectsof having to deal with two separate devices, both in terms of sheer bulkas well as the inconvenience of switching between units. Simply put,there are more things to buy, more things to break, and more things tolose.

Another option is to purchase an add-on telephone device for a PDA.While this option is preferable to carrying two devices around, it stillhas limitations. For example, an add-on telephone device adds bulk toand changes the form factor of the PDA. In addition, since such a PDAmust be designed to operate without an add-on telephone, the degree towhich the user interface of the PDA can be integrated with the userinterface of the add-on telephone is limited. Thus, an add-on solutionis of only limited value, since there is not a true integration betweenthe cellular telephone device and the PDA, but rather two separatedevices at best co-existing side-by-side.

Accordingly, what is needed is a system and method for providing a userinterface to a device featuring integrated functionality of both a PDAand cellular telephone.

SUMMARY

In accordance with the present invention there is provided a system andmethod for using an integrated device featuring functionality of both aPDA and cellular telephone. Features of the present invention include apower button offering control of both the computing and telephonyfunctions of the device; a lid that turns the device on and offdepending on its state, and can also be used to begin and terminatecalls; a jog rocker that activates the device and is used to select froma variety of menu options; application buttons that offer direct accessto applications stored on the device, and which can be configured tooperate in conjunction with secondary keys to offer added functionality;an override-able ringer switch; a keyboard; and an Auto Word Completionfunction that verifies and corrects a user's typing in real time.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is an illustration of a device with keyboard in accordance withan embodiment of the present invention.

FIG. 2 is an illustration of a device without keyboard in accordancewith an embodiment of the present invention.

FIG. 3 is a flow chart illustrating power-on behavior of a device inaccordance with an embodiment of the present invention.

FIG. 4 is a flow chart illustrating power-off behavior of a device inaccordance with an embodiment of the present invention.

FIG. 5 is an illustration of a matrix describing behavior of a lidattached to a device in accordance with an embodiment of the presentinvention.

FIGS. 6a and 6b are illustrations of a keyboard layout in accordancewith an embodiment of the present invention.

FIGS. 7a and 7b illustrates views of a display screen when Option modeand Option Lock mode are activate in accordance with an embodiment ofthe present invention.

FIG. 8 is an illustration of a dialog box presented to a user when acall is incoming in accordance with one embodiment of the presentinvention.

DETAILED DESCRIPTION

fir the discussion set forth below, for purposes of explanation,specific details are set forth in order to provide a thoroughunderstanding of the invention. It will be appreciated by those skilledin the art that the present invention may be practiced without thesespecific details. In particular, those skilled in the art willappreciate that the methods described herein can be implemented indevices, systems and software other than the examples set forth. Inother instances, conventional or otherwise well-known structures,devices, methods and techniques are referred to schematically or shownin block diagram form in order to facilitate description of the presentinvention.

The present invention includes steps that may be embodied inmachine-executable software instructions, and includes method steps thatare implemented as a result of one or more processors executing suchinstructions. In other embodiments, hardware elements may be employed inplace of, or in combination with, software instructions to implement thepresent invention. The software instructions may be stored in RAM orROM, or on other media including removable media.

The present invention includes a user interface for the operation of anintegrated handheld personal computing device and wireless communicationdevice. Referring now to FIG. 1, there is shown an example of such anintegrated device 100. As illustrated in FIG. 1, device 100 includes abase section 102, a lid 104, application and scroll buttons 106, powerbutton 110, antenna 112, jog rocker 114, and ringer switch 116, anddisplay 118. In addition, device 100 includes a keyboard 108. As will beappreciated by those of skill in the art, the present invention mayexist in a variety of embodiments, including embodiments in which theintegrated device includes more or fewer physical components than areillustrated in FIG. 1. For example, FIG. 2 illustrates another device200 that does not have a keyboard, but instead has a writeable area 202enabling input to the device 200 via, for example, a stylus. Forconvenience and clarity, device 100 of FIG. 1 serves as the illustrationthat will be referenced throughout this specification, but suchreference should in no way be understood to restrict what is disclosedto such an embodiment.

Device 100 includes an integrated GSM radio (also referred to as acellular telephone), and while in alternative embodiments is of varyingsizes and shapes, in one embodiment the device is designed to fitcomfortably in a pocket. While the radio uses the GSM standard in oneembodiment, in alternative embodiments the radio may use the CDMAstandard, or any of a variety of other well--known wireless standards.

Power Button

Device 100 has a power button 110, located in one embodiment on the topface, next to the antenna 112. In one embodiment, the power button 110performs the following functions:

A single press and release of the power 110 button toggles device 100on/off.Pressing and holding the power button 110 toggles the radio on/off.Double-tapping the power button 110 toggles a backlight on/off.Triple-tapping the power button 110 inverts the display 118 and insuresthat the backlight is on.A single press of the power button 110 when an incoming call is ringingsilences the ring but does not turn off the device 100.

Referring now to FIG. 3, there is shown a flowchart of the operation ofthe power button functionality starting from a device-off state.Initially, the device 100 is off and the power key is pressed 300. Ifthe key is being pressed for the first time within a given period 302(e.g., it has not been pressed for at least the previous half second),the device 100 is switched on 304. If the power button is held down forlonger than a threshold amount of time, e.g., 1 second 306 then theradio is toggled on or off 308. If the power button is held down forless than the threshold amount 306 then upon release a countdown ofpredetermined length, ½ second, is begun 310. If the power button ispressed 312 during the countdown, then the backlight is toggled on oroff 314. If the cycle is repeated and the power button is pressed for athird time during the countdown 312, then the display 118 is inverted316, and the backlight is preferably turned on if it is not already on.If the power button is not pressed 312 during the countdown, then noadditional actions take place as a result of the power button press.After the display is inverted in step 316, the countdown is once againbegun 318. However, if the power button is pressed during this orsubsequent countdowns 320, the display is again inverted at step 316.This countdown cycle continues until the power button is not pressedduring the countdown 320.

Referring now to FIG. 4, there is shown a flowchart of the operation ofthe power button functionality starting from a device-on state.Initially, the device is on, and the power key is pressed 400. If thepower key is being pressed for the first time 402 (e.g., it has not beenpressed for at least the previous half second), no action is initiallytaken. If the power button is held down for longer than a thresholdamount of time, e.g., 1 second 404 then the radio is toggled on or off406. If the power button is held down for less than the threshold amount404, then upon release a countdown of predetermined length, e.g., ½second, is begun 408. If the power button is not pressed 410 during thecountdown, then the device is turned off 416. If the power button ispressed 410 during the countdown, then the backlight is toggled on oroff 412. If the cycle is repeated and the power button is pressed for athird time during the countdown, then the display is inverted 414, andthe backlight is turned on if not already on. After the display isinverted 414, another countdown is begun 416. If the power button ispressed again 418 during the countdown, then the display is once againinverted 414, and countdown 416 restarted. This continues until thecountdown expires without the power button being pressed 418.

In addition, in one embodiment pressing the power button 110 when thereis an incoming call silences the ring or vibrate. Further, if a call isin progress, pressing the power button turns off the device 100 but doesnot terminate the call. Finally, if the device is off when a call comesin, the device is turned on, and the backlight is illuminated, whichhelps to locate the device 100, e.g., in a poorly-lit room.

Lid

Referring again to FIG. 1, there is shown a view of device 100, having alid 104 attached to base 102. In FIG. 1, lid 104 is connected to base102 via a hinge or other mechanism that allows lid 104 to open andclose. Note that the lid 104 may be connected to base 102 in any of avariety of ways while still including features described herein. Theparticular embodiment of FIG. 1 is therefore meant to illustrate onlyone of many possible configurations.

In one embodiment, lid 104 features a hardware switch for lid open andlid close detection, and may additionally include an integrated speakerfor flip phone-like functionality. When closed, in one embodiment, lid104 covers all of base 102 except for application and scroll buttons106. In one embodiment, lid 104 also includes a transparent window forviewing the display 118 of device 100 while the lid 104 is closed.

The effect of opening and closing the lid 104 varies according to thestate of device 100 at the time the lid 104 is opened or closed. In oneembodiment, and referring now to FIG. 5, opening and closing the lid 104has the following effect:

If the device is off, opening the lid turns on the device 100, andlaunches 502 a predetermined application. In one embodiment, thepredetermined application is a speed dial view of a telephoneapplication, however in other embodiments the application can be anyapplication on the device 100, assignable by the user in one embodimentvia a preferences control panel-type application. If the device is off,closing the lid has no effect 504.

If the device is on, then it is in one of three states: either a call isin progress, a call is incoming, or there is no call activity.

If a call is incoming, then an incoming call notification is given tothe user. An illustration of such a notification is shown in FIG. 8. Itwill be appreciated that a user may be in the process of opening the lidwhen a call comes in. In such a situation, the user may not want toactually take the incoming call. For that reason, if the lid is openedwithin, in one embodiment, one second of the incoming call notification,no action is taken 506 (although the user can still answer the call inother ways, e.g., by tapping a dialog box 802 on the display of device100). In other embodiments, the time maybe shorter or longer than onesecond. If the lid is opened more than one second after the initialincoming call notification, then the call is answered 508. Note alsothat in one embodiment a user can choose to accept or ignore anyincoming telephone call by selecting the answer 802 or ignore 804options presented in a popup dialog box.

Similarly, if the user is in the process of closing the lid when a callcomes in, it is desirable to assume that the lid is being closed not inresponse to the incoming call, but rather by coincidence. Thus, if thelid is closed within an initial time, e.g., one second, of the firstnotification of an incoming call, no action is taken 510. After thisinitial period, if the lid is closed, then in one embodiment the ring issilenced, the call is ignored, and the device is turned off 512.

During an active call, the lid is open in a preferred embodiment, unlessa headset is plugged in. If a call is in progress and the headset isbeing used, then opening the lid has no effect on the call 514. If thelid is closed while a headset call is in progress, the device is turnedoff, but the call is not disconnected 516. If a telephone call is inprogress without using a headset, then closing the lid hangs up thetelephone, in one embodiment after displaying a warning messageconfirming that the call is about to be disconnected, and turns thedevice off 518. During the confirmation warning message, the user hasthe opportunity to tell the device not to disconnect the call, e.g. bypressing the scroll-up button. In alternative embodiments, the call isdisconnected as soon as the lid is closed.

If a telephone call is not in progress, then in one embodiment, openingthe lid when the device is already on has no effect 520. That is, evenif there is an application assigned to be launched upon the opening ofthe lid, when the power is already on, opening the lid does not launchthe assigned application, but rather has no effect on what applicationis currently executing. Also, in one embodiment, if a call is not inprogress, closing the lid turns the device off 522.

In addition, in one embodiment keyboard 108 is deactivated when the lid104 is closed, whether the device 100 is on or off. This guards againstinadvertent input to the device when pressure is applied to the lid,e.g., if the device is carried in a pocket, or if something heavy isplaced on top of the device. In alternative embodiments, the keyboard108 remains active at all times regardless of lid position. In oneembodiment, application and scroll buttons 106 remain active even whenthe lid 104 is closed. This allows the scroll buttons to be used torespond to dialog boxes that may be presented to the user when the lidis closed. For example, if an alarm goes off, the user can dismiss thealarm by pressing a scroll button, instead of having to open the lid totap the display 118 or press a button on the keyboard 108.

Jog Rocker

Device 100 includes a jog rocker 114 such as is pictured in FIG. 1. Ajog rocker in one embodiment allows four input actions: up, down, pressin, and press and hold.

While individual applications provide specific responses to input fromjog rocker 114, in one embodiment pressing the jog rocker 114 whendevice 100 is turned off wakes device 100 up and launches a predefinedapplication, such as the phone application in one embodiment.

In one embodiment, this behavior is executed on jog rocker 114 press,not release, so one embodiment, this behavior is executed on jog rocker114 press, not release, so that a press and hold of the jog rocker 114wakes the device up, launches the predefined application on the press,and then executes within the application whatever that application hasspecified for a jog rocker 114 hold on the hold.

In another embodiment, jog rocker 114 can be used to provide a scroll-up and scroll-down function similar to that provided by scroll buttons106. In one embodiment this is the default use for jog rocker 114 whenan application does not provide additional functionality for the jogrocker.

Ringer Switch

Ringer switch 116 is used in a preferred embodiment to select whetherincoming telephone calls should produce an audible ringing sound ondevice 100. In a first position, device 100 produces such a ring tone,which is customizable in one embodiment using application softwarestored on device 100. In a second position, device 100 does not producea ring tone for an incoming call. In one embodiment, device 100 isconfigured to vibrate in response to an incoming telephone call. Thevibrate feature of device 100 may additionally be activated byapplications executing on device 100, for example even when ringerswitch 116 is in the first position (the audible ring position).

In one embodiment, when ringer switch 116 is in the second position, allsounds made by device 100 are muted, and not just the ring tone. Thus,for example, while a number of applications executed on device 100,e.g., an alarm, a message alert, etc., may instruct device 100 toproduce a sound, the location of the switch in the second position willstop device 100 from actually making the sounds. In yet anotherembodiment, device 100 allows software resident on device 100 tooverride the physical setting of ringer switch 116. This may be ofparticular use, for example, if the ringer switch is in the firstposition while a call is in progress and it is undesirable to havesounds from device 100 interfering with the call in an annoying fashion.

Application Buttons

A device such as device 100 typically has one or more application andscroll buttons 106 located physically on the device, providing directaccess to applications associated with the buttons, as well as up-downand left-right scroll functionality. Using a keyboard 108 of device 100,different applications are assignable to the application buttons 106being pressed in combination with a modifier key. In one embodiment, an“option” key is the modifier key for these key combinations.

In one embodiment, the following applications are mapped to option and(“+”) application button combinations:

Option+Phone Application button maps to Memo Pad.Option+Calendar Application button maps to To-Do.Option+Internet Browser Application button maps to City Time.Option+Messaging Application button maps to the calculator.

In one embodiment, the Option+Application button key combination worksboth in series and in parallel. For example, pressing and releasing theOption button (a serial combination), then pressing an applicationbutton 106 launches the application that is mapped to that applicationbutton's option modification. Similarly, pressing and holding the Optionbutton while pressing the application button 106 (a parallelcombination) also launches that application button's optionmodification.

If the option modification times out before the application button 106is pressed, then the functionality is the same as if only theapplication button had been pressed.

Pressing and holding Option, and then pressing an application button 106while Option is still held down also launches the application that ismapped to that applications button's option modification. What occurs ifthe user continues to hold the application button in is controlled on anapplication-by-application basis.

In one embodiment, the following application buttons 106 andcombinations are flappable:

a Phone Application button.a Calendar Application button.an Internet Browser Application button.a Messaging Application button.

In alternative embodiments, the following; combinations are alsomappable:

Option+Calendar Application button,Option+Phone Application button.Option+Internet Browser Application button.Option+Messaging Application button.

Keyboard

In one embodiment, keyboard 108 includes the following keys:

a-z (26 keys). (period)

Symbol key Space Return Backspace Shift key Option key Menu key.

FIG. 6a illustrates one embodiment of a keyboard 108 layout. In FIG. 6A,the bottom label of each key indicates its normal character, while thetop left label indicates its shift key character, and the top rightlabel indicates its option key character.

FIG. 6b illustrations just the number/punctuation keys extracted fromFIG. 6 a.

in an unmodified state, the keys produce the main character printed onthem. In one embodiment, there is no on screen-modification stateindicator for the unmodified keyboard state. In Shift state, the keysproduce a capital version of the main character printed on them, asillustrated in FIG. 6 a.

In Option state, the keys produce the alternate character illustrated inFIG. 6 b.

in one embodiment, pressing the Option key once puts device 100 inOption state. Pressing Option in Option state puts the device in OptionLock state, Pressing Option in Option Lock state clears the state.Option state is canceled upon the entry of the Option-modifiedcharacter. Option Lock state is not canceled upon the entry of theOption-modified character, hence the Lock-ness. Option state can becanceled without entering a character by pressing the Option key twice(once for lock, the second for clear) or pressing backspace. Note thatin one embodiment, backspace cancels Option state, but not Option Lockstate.

Referring now to FIG. 7a , in one embodiment, an on-screen modificationstate indicator 702 for Option state, which indicates to the user thatthe Option key has been pressed, is an oval tilted to have the sameappearance as the shape of the Option key itself.

Referring now to FIG. 7b , the on-screen modification state indicator704 for Option Lock state is similar to the Option state indicatorexcept with a “bottom bar”.

Holding down a key for a prolonged period causes the key to repeat. Inone embodiment, all text entry has the same repeat rate, i.e. holdingdown the j produces j's at the same rate as holding down shift+jproduces J's and option +j produces 5's. The Option and Shift keys both“time out” if additional input is not received within a prescribedperiod of time, e.g., 3 seconds in one embodiment. Note that in oneembodiment the Option Lock and Shift Lock states do not time out.

In addition, in a preferred embodiment, when the currently executingapplication on device 100 changes from a first application to a secondapplication, the Shift state is cleared to avoid unintended Shiftedinput into the second application.

Auto Word Completion

in order to provide a fast and easy way to enter awkward oroften-misspelled text, device 100 includes a wordauto-completion/correction system that in one embodiment checks everyword that a user enters against a database of common misspellings andconvenient abbreviations and replaces the entered word with a presetcorrect or complete version of the word. For example, if a user enters‘beleive’, it will automatically be replaced with ‘believe’. If a userenters ‘im’, it will be replaced with ‘I'm’.

In one embodiment, Word Completion executes whenever a user enters anycharacter that signals that they are finished typing the previous word,e.g.:

Space

Any punctuation

Tab Return Next or Previous Field.

For instance, when a user types b,e,l,e,i,v,e the word ‘beleive’ isstill displayed. If the user then enters a space (or any of thecharacters listed above) then ‘beleive’ is replace by believe'. Typingbackspace once will erase the space (or tab, new line, etc.) thatinvoked the Word Completion. Typing backspace a second time will undothe word completion without deleting the last character of the word. Atthis point, typing any of the characters that usually invoke WordCompletion will not invoke it again.

If the replacement, word in the database is not capitalized, then thecapitalization of the word to be replaced is maintained. For instance,there is an entry in the Word Completion database that has the wrongword “feild” marked to be replaced with “field” so:

feild becomes fieldFeild becomes Field.

If the replacement, word in the database is capitalized, then theresulting word is capitalized no matter what the capitalization of theword to be replaced was. For instance, there is an entry in the Word.Completion database that has the wrong word “im” marked to be replacedwith “I'm” so:

im becomes I'mlm becomes I'm.

Keyboard Navigation and Commands

In one embodiment, device 100 switches off or “sleeps” in order toconserve power after a predefined period of time. In such circumstance,pressing a. key on the keyboard 108 wakes the device back up, i.e.restoring the device to a power on state in the same condition that itwas in prior to going to sleep. In other embodiments, waking the device100 up is equivalent to a power on command, which starts the device witha predefined initial application. Note that the keys which will wake thedevice up may be predetermined, or may be changeable by the user.

In one embodiment, some navigational activities of device 100 arekeyboard enabled. Buttons such as “OK,” “Done,” and “Cancel” are mappedto certain keys and key combinations. Common actions, which may also beon-screen buttons like “New” and “Details . . . ,”are frequentlyincluded as menu items. These menu items have menu button+lettercombinations assigned to them so that they may be executed easily fromthe keyboard 108.

In one embodiment, menus on device 100 are navigable via a menu key andmenu mode. Pressing and releasing a dedicated hardware menu key onkeyboard 108 displays a first pull-down menu of the current view.Pressing and releasing the menu key a second time dismisses the menu.

While the menu is being displayed, in one embodiment the user cannavigate the menus and execute menu items with the following actions:

Scroll Up displays the next menu list to the right.

Scroll Up from the last menu list scrolls back to the first.

Holding Scroll Up repeats this action at the normal repeat rate.

Scroll Down moves a highlight down through the current displayed list ofmenu items.

If there is no highlighted item, such as when the menu list is firstdisplayed, then the first press of Scroll Down highlights the first menuitem.

Scroll Down from the last menu item in the list scrolls back to thefirst item in the same list.

Holding Scroll Down repeats this action at the normal repeat rate.

Space executes the :highlighted menu item on press.Return also executes the highlighted menu item on press.Backspace dismisses the menu.At any time when any menu is displayed, pressing any of the short cutletters executes the corresponding menu item, even if that menu item isin a menu list that is not currently displayed.Typing any character that is not detailed above or a short cut letterplays an error beep.

At any time, whether or not a menu is displayed, pressing and holdingthe menu key and pressing a one of the shortcut letters executes thecorresponding menu item, in one embodiment, without the menu being drawnon the screen. Pressing and releasing the menu key and then pressing theshortcut letter will display the menu, however, in one embodiment.

Any menu that is being displayed is dismissed whenever a menu item isexecuted. Shift Lock and Option Lock are ignored when entering short cutletters. It is possible, however, to enter an option character as ashort cut character in

User presses the menu button to enter menu mode.User presses and holds Option.User presses x for instance.The menu item with the short cut character? would get executed, becausethe question mark (?) is formed by pressing Option-x.Pressing and releasing Option and then pressing x would execute the menuitem with the short cut letter x.

Menu mode itself will not clear the modification state, but theexecution of a menu item may dear the modifications state depending onwhat that menu item does.

User starts in Option Lock.User presses the menu button.User presses the menu button again to dismiss the menu.The user should still be in Option Lock.

Thus, when buttons containing certain text are on the screen, certainkeys or key combinations can be pressed that will execute the buttons asif they were pressed on the screen.

The buttons that are mapped to the keyboard in one embodiment are:

OK

Done

Cancel

Yes

No

Next

Previous.

The following four keys/key combinations are used for mapping to certaincommon on-screen buttons in one embodiment:

Return Backspace Option+Return Option+Backspace

Option+Return and Option+Backspace will work on in parallel.

Globally, in one embodiment:

Option+Return executes:

OK

Done

Yes

Next

Send

Accept

Option+Backspace executes:

Cancel

No

Previous

Back

Reject

In one embodiment, if there is no opportunity for text entry on aparticular screen, then the holding down of the Option key may beunnecessary. Thus, for example, within the context of alert dialogs:

Return executes:

OK

Done

Yes

Next

Send

Accept

Backspace executes:

Cancel

No

Previous

Back

Reject

Return and Backspace do not map to buttons in other contexts in oneembodiment, since in other contexts there will likely be text areas inwhich Return and Backspace benefit from their normal functionality.

In addition, in one embodiment the mappings described above also applyto non-English based applications. For example, Option+Return is mappedto “Oui” in a French language application. This allows a user to executea foreign-language application on device 100 while providing similarfunctionality to an English-language application.

The foregoing discloses exemplary methods and embodiments of the presentinvention. It will be understood that the invention may be embodied inother forms and variations without departing from the spirit or scope ofthe invention. Accordingly, this disclosure of the present invention isillustrative, but not limiting, of the invention, the scope of which isdefined by the following claims.

What is claimed is:
 1. A method performed by one or more processors of amobile computing device, the method comprising: executing a firstapplication using the one or more processors; receiving, duringexecution of the first application, a user selection of a shift key;transitioning a state of the shift key from an unlocked non-shift stateto a shift state based on the user selection; changing the execution ofthe first application to an execution of a second application; andclearing the state of the shift key in response to changing theexecution from the first application to the second application.
 2. Themethod of claim 1, wherein the clearing comprises: transitioning thestate of the shift key from the shift state to the unlocked non-shiftstate.
 3. The method of claim 2, further comprising: avoiding unintendedshift key input during execution of the second application based ontransitioning the state of the shift key from the shift state to theunlocked non-shift state.
 4. The method of claim 1, further comprising:detecting the user pressing the shift key for a first period of time;transitioning the state of the shift key to a shift lock state based onthe user pressing the shift key for the first period of time; andcanceling the shift lock state of the shift key if additional user inputis not detected within a second period of time.
 5. The method of claim1, further comprising: receiving a user selection of a key correspondingto a character; presenting, on a touch-sensitive display of the mobilecomputing device, a non-capitalized version of the character based onthe shift key being in the unlocked non-shift state and presenting, onthe touch-sensitive display of the mobile computing device, acapitalized version of the character based on the shift key being in theshift state.
 6. The method of claim 1, further comprising: receiving auser selection of a key corresponding to a character while the shift keyis in the shift state; presenting, on a touch-sensitive display of themobile computing device, a capitalized version of the character based onthe shift key being in the shift state; and canceling the shift state ofthe shift key in response to presenting the capitalized version of thecharacter.
 7. The method of claim 1, further comprising: receiving asecond user selection of the shift key during execution of the firstapplication; and transitioning the state of the shift key from the shiftstate to a shift lock state based on the second user selection.
 8. Themethod of claim 7, further comprising: presenting, on a touch-sensitivedisplay of the mobile computing device, capitalized versions of anynumber of characters subsequently selected by the user based on theshift key being in the shift lock state.
 9. The method of claim 7,further comprising: receiving a third user selection of the shift keyduring execution of the first application; and canceling the shift lockstate of the shift key based on the third user selection.
 10. The methodof claim 1, further comprising: transitioning the state of the shift keyfrom the shift state to a shift lock state during execution of the firstapplication in response to receiving a second user selection of theshift key; and transitioning the state of the shift key from the shiftlock state to the unlocked non-shift state during execution of the firstapplication in response to receiving a third user selection of the shiftkey.
 11. A mobile computing device, comprising: a touch-sensitivedisplay; one or more processors; and a memory resource storinginstructions that, when executed by the one or more processors, causethe mobile computing device to: execute a first application using theone or more processors; receive, during execution of the firstapplication, a user selection of a shift key; transition a state of theshift key from an unlocked non-shift state to a shift state based on theuser selection; change the execution of the first application to anexecution of a second application; and clear the state of the shift keybased in response to changing the execution from the first applicationto the second application.
 12. The mobile computing device of claim 11,wherein execution of the instructions to clear the state of the shiftkey causes the mobile computing device to: transition the state of theshift key from the shift state to the unlocked non-shift state.
 13. Themobile computing device of claim 12, wherein execution of theinstructions causes the mobile computing device to: avoid unintendedshift key input during execution of the second application based ontransitioning the state of the shift key from the shift state to theunlocked non-shift state.
 14. The mobile computing device of claim 11,wherein execution of the instructions causes the mobile computing deviceto further: detect the user pressing the shift key for a first period oftime; transition the state of the shift key to a shift lock state basedon the user pressing the shift key for the first period of time; andcancel the shift lock state of the shift key if additional user input isnot detected within a second period of time.
 15. The mobile computingdevice of claim 11, wherein execution of the instructions causes themobile computing device to further: receive a user selection of a keycorresponding to a character; present, on a touch-sensitive display ofthe mobile computing device, a non-capitalized version of the characterbased on the shift key being in the unlocked non-shift state andpresent, on the touch-sensitive display of the mobile computing device,a capitalized version of the character based on the shift key being inthe shift state.
 16. The mobile computing device of claim 11, whereinexecution of the instructions causes the mobile computing device tofurther: receive a user selection of a key corresponding to a characterwhile the shift key is in the shift state; present, on a touch-sensitivedisplay of the mobile computing device, a capitalized version of thecharacter based on the shift key being in the shift state; and cancelthe shift state of the shift key in response to presenting thecapitalized version of the character.
 17. The mobile computing device ofclaim 11, wherein execution of the instructions causes the mobilecomputing device to further: receive a second user selection of theshift key during execution of the first application; and transition thestate of the shift key from the shift state to a shift lock state basedon the second user selection.
 18. The mobile computing device of claim17, wherein execution of the instructions causes the mobile computingdevice to further: present, on a touch-sensitive display of the mobilecomputing device, capitalized versions of any number of characterssubsequently selected by the user based on the shift key being in theshift lock state.
 19. The mobile computing device of claim 17, whereinexecution of the instructions causes the mobile computing device tofurther: receive a third user selection of the shift key duringexecution of the first application; and cancel the shift lock state ofthe shift key based on the third user selection.
 20. The mobilecomputing device of claim 11, wherein execution of the instructionscauses the mobile computing device to further: transition the state ofthe shift key from the shift state to a shift lock state duringexecution of the first application in response to receiving a seconduser selection of the shift key; and transition the state of the shiftkey from the shift lock state to the unlocked non-shift state duringexecution of the first application in response to receiving a third userselection of the shift key.